xuzifu666 commented on PR #4287:
URL: https://github.com/apache/calcite/pull/4287#issuecomment-2785804609

   > If there is official statement to doesn't support these types, we can 
currently throw an exception and describe the situation clearly in Jira or Java 
doc.
   
   @NobiGo I had asked some Hive experts about it and search in Hive and 
Phoenix doc, Hive/Phoenix may not support cast nested type, we can refer in doc:
   Hive: https://hive.apache.org/docs/latest/122917025/     
   seems only support base type cast.
   Phoenix: https://phoenix.apache.org/language/index.html
   
   If OK, I would modify as your suggestion.


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